Sandblasting was my first idea, but we don't have one anymore, I bet it would look awesome as well as having extreme grip. Do you have any pics of lights you've done?There are a lot of grit levels of bead / sand blasting that can be used. It is easy to get carried away and use too aggressive of approach.
Some people use tumbling to clean / polish out stones, reloading brass and aluminum parts.
It looks very nice! I had the brass version and it was finished like that, just yellow.Love my TS10 that i sanded the anodizing off of